Please help! I do not understand what I am doing with the following problem. Also, please break it down in simple steps since I am having a hard time understanding this chapter.

How do I solve this problem?

A researcher wishes to estimate the percentage of adults who abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 3 percentage points with 99% confidence if

a) he uses a previous estimate of 26%

b) he does not use any prior estimates?

Use the standard normal distribution table

a) n= __________________________(Round up to the nearest integer)

b) n= _________________________ (Round up to the nearest integer)